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userinput.go
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/
userinput.go
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package commands
import (
"bytes"
"fmt"
"strings"
"syscall"
"unicode"
"golang.org/x/term"
)
const (
pwdSpecialChars = "!@#$%^&*()_+="
pwdLength = 10
)
var errInvalidPassword = fmt.Errorf("xipher: please set a decent password with at least %d characters, including at least one uppercase letter, one lowercase letter, one number, and one of the following special characters: %s", pwdLength, pwdSpecialChars)
func pwdCheck(password string) error {
var (
upp, low, num, sym bool
tot uint32
)
for _, char := range password {
switch {
case unicode.IsUpper(char):
upp = true
tot++
case unicode.IsLower(char):
low = true
tot++
case unicode.IsNumber(char):
num = true
tot++
case strings.ContainsRune(pwdSpecialChars, char):
sym = true
tot++
default:
return errInvalidPassword
}
}
if !(upp && low && num && sym && tot >= pwdLength) {
return errInvalidPassword
}
return nil
}
func getHiddenInputFromUser(prompt string) ([]byte, error) {
fmt.Print(prompt)
input, err := term.ReadPassword(int(syscall.Stdin))
fmt.Println()
return input, err
}
func getPasswordFromUser(confirm, ignorePolicyCheck bool) ([]byte, error) {
password, err := getHiddenInputFromUser("Enter a Password: ")
if err != nil {
return nil, err
}
if !ignorePolicyCheck {
if err = pwdCheck(string(password)); err != nil {
return nil, err
}
}
if confirm {
if confirmPassword, err := getHiddenInputFromUser("Confirm Password: "); err != nil {
return nil, err
} else if !bytes.Equal(password, confirmPassword) {
return nil, fmt.Errorf("passwords do not match")
}
}
return password, nil
}